2007 MITSUBISHI LANCER EVOLUTION wheel

35B-1
ANTI-SKID
BRAKING SYSTEM
(ABS) <4WD>
CONTENTS
GENERAL INFORMATION 2..................
SERVICE SPECIFICATIONS 3.................
LUBRICANTS Refer to GROUP 35A..........
SEALANT Refer to GROUP 35A..............
SPECIAL TOOLS 4...........................
TROUBLESHOOTING 4.......................
ON-VEHICLE SERVICE 26....................
Brake Pedal Check and Adjustment
Refer to GROUP 35A ..........................
Brake Booster Operating Test
Refer to GROUP 35A ..........................
Check Valve Operation Check
Refer to GROUP 35A ..........................
Bleeding Refer to GROUP 35A..................
Brake Fluid Level Sensor Check
Refer to GROUP 35A ..........................
Disc Brake Pad Check and
Replacement Refer to GROUP 35A..............Disc Brake Rotor Check Refer to GROUP 35A...
Brake Disc Thickness Check
Refer to GROUP 35A ..........................
Brake Disc Run-out Check and Correction
Refer to GROUP 35A ..........................
Wheel Speed Sensor Output Voltage Check
26 ............................................
Hydraulic Unit Check 28........................
Remedy for a Flat Battery 29...................
BRAKE PEDAL Refer to GROUP 35A........
MASTER CYLINDER AND BRAKE
BOOSTER Refer to GROUP 35A............
DISC BRAKE Refer to GROUP 35A..........
HYDRAULIC UNIT AND ABS-ECU 30.........
WHEEL SPEED SENSOR 33..................
G SENSORS AND STEERING WHEEL
SENSOR 35..................................

ABS <4WD> -General Information35B-2
GENERAL INFORMATION
ABS has been adopted as optional equipment in
RS-IIto maintain directional stability and steering
performance during sudden braking or braking on
slippery road surfaces.
The ABS control method is a 4-sensor, 4-channel
method which provides independent control for all
wheels.
Following system for Lancer EVOLUTION-VII has
been modified from Lancer EVOLUTION-VI Tommi
Makinen Edition.DBy adding lateral G sensor, longitudinal G
sensor and steering wheel sensor, optimized
ABS control at the time of cornering.
DBy inputting parking brake switch signal to
ABS-ECU with pulling parking brake lever, ABS
control has been optimized.
DABS-ECU outputs ABS signal to 4WD-ECU.
DG sensor (lateral), steering wheel sensor and
parking brake switch have been added to the
diagnosis and service data.
DABS-ECU connector has been changed.
EBD CONTROL
In ABS, electronic control method is used by which
the rear wheel brake hydraulic pressure during
braking is regulated by rear wheel control solenoid
valves in accordance with the vehicle’s rate of
deceleration and the front and rear wheel slippage
which are calculated from the each wheel speed
sensor’s signal. EBD control is a control system
which provides a high level of control for both vehicle
braking force and vehicle stability. The system has
the following features:
DBecause the system provides the optimum rear
wheel braking force regardless of the vehicleladen condition and the condition of the road
surface, the system reduces the required pedal
depression force, particularly when the vehicle
is heavily laden or driving on road surfaces
with high frictional coefficients.
DBecause the duty placed on the front brakes
has been reduced, the increases in pad
temperature can be controlled to improve the
wear resistance characteristics of the pad,
during front brakes applying.
DControl valves such as the proportioning valve
are no longer required.
SPECIFICATIONS
ItemSpecifications
ABS control method4-sensor, 4-channel
No. of ABS rotor teethFront43
Rear43
ABS speed sensorTypeMagnet coil typep
Gap between sensor and rotor mm0.85 / 0.60 (non-adjustable type)

ABS <4WD> -General Information/Service Specifications35B-3
CONSTRUCTION DIAGRAM
Stop lamp
switch*Parking brake
switch
Diagnosis
connector*
Wheel speed sensorWheel speed sensor Hydraulic unit
assembly*
(integrated with
the ABS-ECU) ABS warning lamp
Lateral G sensor
Longitudinal G sensor Steering
wheel
sensor*
NOTE
For R.H. drive vehicles, only the position indicated by the * is symmetrical.
SERVICE SPECIFICATIONS
ItemsStandard value
Wheel speed sensor internal resistance kΩ1.24 - 1.64
Wheel speed sensor insulation resistance kΩ100 or more
Lateral G sensor/Longitudinal G
sensoroutputvoltageV
On stationary vehicle2.4 - 2.6
sensor outputvoltageV
With front mark downward3.4 - 3.6

ABS <4WD> -Troubleshooting35B-7
INSPECTION CHART FOR DIAGNOSIS CODES
Diagnosis code No.Inspection itemReference page
11Front right wheel speed sensor (Open circuit or short circuit)35B-9
12Front left wheel speed sensor (Open circuit or short circuit)
13Rear right wheel speed sensor (Open circuit or short circuit)
14Rear left wheel speed sensor (Open circuit or short circuit)
16*ABS-ECU power supply system (Abnormal voltage drop or rise)35B-10
21Front right wheel speed sensor35B-9
22Front left wheel speed sensor
23Rear right wheel speed sensor
24Rear left wheel speed sensor
32Longitudinal G sensor system35B-11
41Front right solenoid valveThe diagnosis codes are output
whenthereisnoresponsetothe
35B-12
42Front left solenoid valve
whenthereis no responsetothe
drive signals for respective solenoid
valvesortheABS ECUpower43Rear right solenoid valvevalves or theABS-ECUpower
supply system is defective.
44Rear left solenoid valve
51Valve relay problem (stays on)35B-30, 31
(Replace the
hydraulic unit and
ABS-ECU.)
52Valve relay problem (stays off) or ABS-ECU power supply system
problem35B-12
53Motor relay problem (stays off) or ABS-ECU power supply system
problem
54Motor relay problem (stays on)35B-30, 31
(Replace the
hydraulic unit and
ABS-ECU.)
55Motor system (seized pump motor) or ABS-ECU power supply system
problem35B-12
63ABS-ECU35B-30, 31
(Replace the
hydraulic unit and
ABS-ECU.)
71Lateral G sensor system35B-13

ABS <4WD> -Troubleshooting35B-8
Diagnosis code No.Reference page Inspection item
81Steering wheel sensor (ST-1) system (Open circuit or short circuit)35B-14
82Steering wheel sensor (ST-2) system (Open circuit or short circuit)
83Steering wheel sensor (ST-N) system (Open circuit or short circuit)
NOTE: diagnosis code No.16, 52, 63
1. Code No. 16 is cleared from the memory by turning the ignition switch to ACC position. When the system
is properly reset, this code is also cleared from the memory.
2. Code No. 52 and 63 are cleared from the memory by turning the ignition switch to ACC position.

ABS <4WD> -Troubleshooting35B-9
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code Nos.11, 12, 13 and 14 Wheel speed sensor
(open circuit or short circuit)Probable cause
Code Nos.21, 22, 23 and 24 Wheel speed sensor
Code Nos. 11, 12, 13 and 14 are output if the ABS-ECU detects an open circuit
or short-circuit in the (+) wire or ( - ) wire in any one of the four wheel speed sensors.DMalfunction of wheel speed sensor
DMalfunction of wiring harness or connector
DMalfunction of hydraulic unit and ABS-ECU
Code Nos. 21, 22, 23 and 24 are output in the following cases.
DWhen there is no input from any one of the four wheel speed sensors when travelling
at several km/h or more, even though open circuit can not be verified.
DWhen a chipped or blocked-up ABS rotor is detected and if the anti-lock system
operates continuously because a malfunctioning sensor or a warped ABS rotor
is causing sensor output to drop.DMalfunction of wheel speed sensor
DMalfunction of wiring harness or connector
DMalfunction of ABS rotor
DToo much gap between the sensor and the ABS rotor
DMalfunction of hydraulic unit and ABS-ECU
DMalfunction of wheel bearing
NG
NG
Replace
OK
Check the harness wire, and repair if necessary.
DBetween each wheel speed sensor and ABS-ECU
NG
Repair
OK
Wheel bearing check
(Refer to GROUP 26 and
GROUP 27 - On-vehicle
Service.)
NG
Repair
NG
Replace the hydraulic unit and ABS-ECU.
OK
Check the trouble
symptom.
Check the following connector:B-123
OK
ABS rotor check
(Refer to P.35B-34.)NG
Replace
NG
Wheel speed sensor
check
(Refer to P.35B-34.)NG
Replace
OK
Wheel speed sensor output voltage check (Refer to P.35B-26.)OK
Check the trouble
symptom.
OK
Check the following connectors:
A-03, A-37, A-43 , C-111, C-128, C-136 drive vehicles>, C-146, D-04, D-10, D-30
OK
Measure at the ABS-ECU connector B-123.
DDisconnect the connector, and measure at the harness side
connector.
DResistances between 6 and 7, 8 and 9, 22 and 31, 29 and
30
OK:1.24 - 1.64 kΩNGWheel speed sensor check (Refer to P.35B-34.)
Wheel speed sensor installation checkNG
Repair

ABS <4WD> -Troubleshooting35B-14
Code No.81 Steering wheel sensor (ST-1) system (open
circuit or short circuit)Probable cause
Code No.82 Steering wheel sensor (ST-2) system (open
circuit or short circuit)
Code No.83 Steering wheel sensor (ST-N) system (open
circuit or short circuit)
These codes are output if there is a fault in the steering wheel sensor, an open circuit
or short circuit in the steering signal line, or the internal circuit in the hydraulic unit
and ABS-ECU is defective.DMalfunction of steering wheel sensor
DMalfunction of wiring harness or connector
DMalfunction of hydraulic unit and ABS-ECU
NG
Repair
Replace the hydraulic unit and ABS-
ECU. OK NG YES
Repair
NOAre the diagnosis code Nos.81, 82 and
83 output at the same time?
OKCheck the following connectors:
B-123, C-128 ,
C-147 , C-230
YES
NO
Is the ACD system diagnosis code
No.31 output at the same time?
NG
Check the trouble symptom.
(1) NG
(2) NGNG
Repair
NG
OK
Check the trouble
symptom.
Check the following connectors:
C-102, C-209, C-210, C-230
Check the harness wire, and repair if
necessary.
DBetween ignition switch and steering
wheel sensor
NG
OK
Check the trouble
symptom.
Check the following connectors:
C-08, C-230
Check the harness wire, and repair if
necessary.
DBetween steering wheel sensor and
body earth
OK
Measure at the steering wheel sensor
connector C-230.
DDisconnect the connector, and
measure at the harness side
connector.
(1) Voltage between 2 and body earth
(Ignition switch: ON)
OK:System voltage
(2) Continuity between 3 and body earth
OK:Continuity
NG
RepairOK
Check the harness wire.
DBetween ABS-ECU and steering
wheel sensor NG
Repair
NG OK
Check the trouble
symptom.
Check the following connectors:
C-133, C-228, B-109
NG
Repair
Check the harness wire.
DBetween ABS-ECU and steering
wheel sensor
OK
Replace the steering wheel sensor. NG
Time Voltage
2.7 - 4.4 V
0.8 - 2.1 V
Variations in voltage when turning the steering wheel laterally
Measure at the steering wheel sensor connector C-230.
DConnect the connector and measure by turning the steering wheel laterally in the neutral
position.
DIgnition switch: ON
(1) Voltage between 1 and body earth
(2) Voltage between 4 and body earth
(3) Voltage between 5 and body earth
OK:Refer to the figure below

ABS <4WD> -Troubleshooting35B-15
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomsInspection procedure
No.Reference page
Communication between the MUT-IIand the whole system is not
possible.135B-16
Communication between the MUT-IIand the ABS-ECU is not possible.235B-17
When the ignition key is turned to “ON” (engine stopped), the ABS
warning lamp does not illuminate.335B-18
Even after the engine is started, the ABS warning lamp remains
illuminated.435B-18
In the inspection with MUT-II service data, the parking brake switch is not
turned ON or turn OFF.535B-19
The neutral position learning of the steering wheel sensor is not finished.635B-20
Faulty ABS operation735B-21
Caution
1. If steering movements are made when driving at high speed, or when driving on road surfaces
with low frictional resistance, or when passing over bumps, the ABS may operate even though
sudden braking is not being applied. Because of this, when getting information from the customer,
check if the problem occurred while driving under such conditions as these.
2. During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such
phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent
the wheels from locking and is not an abnormality.